Fletcher, J.D., C.M. France, and R.C. Butler. “Virus Surveys of Lettuce Crops and Management of Lettuce Bigvein Disease in New Zealand”. New Zealand Plant Protection 58 (August 1, 2005): 239–244. Accessed May 22, 2022. https://journal.nzpps.org/index.php/nzpp/article/view/4287.